If you made it there by doing quests, you are just fine. People who do all the side quests might be a higher level when they start Dragonspyre, but it's not a necessity.
If you find yourself struggling a bit, a suggestion might be to do some lower side quests you hadn't done yet to gain a level or two. It can make a difference.
As a rule, I do all the side quests through the end of Dragonspyre, because I know Celestia makes a big jump in fighting the bad guys and you want to make sure you are at least level 50 when you get to Celestia so you can buy gear with critical and critical block.